USGS: Science Topics: geochemistry

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Geochemistry

Study of the distribution of chemical elements and natural compounds on the earth and in the atmosphere and the chemical processes that affect the earth.

Subtopics:
Soil chemistry (4 items)
Water chemistry (120 items)

Geochemical anomaly maps (9 items)

Related topics:

Results 111 - 120 of 175 listed by similarity [list alphabetically]

Organic compounds in Truckee River water used for public supply near Reno, Nevada, 2002-05 [More info]: A preliminary indication of the potential importance of compounds detected in source water to the quality of finished water prior to distribution.
Organic compounds in White River water used for public supply near Indianapolis, Indiana, 2002-05 [More info]: Measured concentrations of many compounds in water people use. Some compounds are regulated as health hazards; a few of these were over the benchmark limits. Others may become issues of concern, so studies such as this give us helpful background levels.
Organic metamorphism in the California petroleum basins: Chapter A - ROCK-EVAL and vitrinite reflectance [More info]: Part A of a complex report on the results of ROCK-EVAL and vitrinite reflectance analysis of a large sample base from more than 70 wells located in three oil-rich California petroleum basins in order to study the formation of oil deposits.
Organic metamorphism in the California petroleum basins: Chapter B - Insights from extractable bitumen and saturated hydrocarbons [More info]: Part B of a complex report on the results of geochemical analysis of 75 shale samples from the Los Angeles, Ventura, and San Joaquin Basins to gather observations relevant to exploration regarding the formation of oil deposits in these basins.
Parking-lot sealcoat: A major source of PAHs in urban and suburban environments [More info]: Explanation of chemical contaminants released into aquatic environments by popular sealcoating compounds used in parking lots, with frequently-asked questions, links, and contact information.
Pathways of metal transfer from mineralized sources to bioreceptors [More info]: A synthesis of the Mineral Resources Program's past and future research directions in the western U.S. on metal contamination due to mineral deposits and mining and the environmental effects on living organisms. Chapters 1, 4, and 6 as PDF files.
Periodic table page [More info]: An "image map" periodic table and short notes about many isotopes and their applications to illustrate the uses of assorted isotopes in hydrology, geology, and biology.
Pesticides in Ground Water of Wyoming, 1995-2006 [More info]: Summarizes ground-water pesticide monitoring results, shows vulnerability of aquifers to contamination.
Pesticides in Wyoming's rivers, 2006-10 [More info]: Sampling for pesticide contamination in four major rivers in in the Bighorn and North Platte River Basins, begun in 2006 and resampled in 2009 and 2010 revealed concentration at levels below the standards for drinking water.
Phosphorus and groundwater: Establishing links between agricultural use and transport to streams [More info]: Explains why phosphorus is important, how it moves through the terrestrial water system, how we measure it, and what this means for people who need to manage or monitor human activities that produce it.

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